in a clinical trial, pradaxa 150 mg reduced stroke risk 35% more than warfarin. and with pradaxa, there's no need for those regular blood tests. pradaxa is progress. pradaxa can cause serious, sometimes fatal, bleeding. don't take pradaxa if you have abnormal bleeding, and seek immediate medical care for unexpected signs of bleeding, like unusual bruising. pradaxa may increase your bleeding risk if you're 75 or older, have kidney problems or a bleeding condition, like stomach ulcers. or if you take aspirin products, nsaids, or blood thinners. tell your doctor about all medicines you take, any planned medical or dental procedures, and don't stop taking pradaxa without your doctor's approval, as stopping may increase your stroke risk. other side effects include indigestion, stomach pain, upset, or burning. if you have afib not caused by a heart valve problem, ask your doctor if pradaxa can reduce your risk of a stroke.